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Slow relaxation of spin reorientation following ultrafast optical excitation
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View: Figures


Image of FIG. 1.
FIG. 1.

X-PEEM images taken at different delay times show the dynamic response of the Fe magnetization to the laser pulse. (a) before the pump pulse arrives. [(b)–(f)] The XMCD signal in the center of the laser spot oscillates as a function of from bright at (c) to dark at (d) and bright again in (f). The scale bar corresponds to .

Image of FIG. 2.
FIG. 2.

(Color online) Dynamic magnetic response. (a) Black: magnetic signal measured in the center of the laser spot, red and green: fits, as described in the text. The blue curve shows the simulated dynamic temperature of the topmost Fe layer, scaled to the maximum amplitude of the magnetic signal. [(b)–(d)] Schematic diagram: (b) The laser pulse causes to rotate out of the sample plane. (c) This triggers a damped precession of the magnetization around the new direction of . (d) relaxes slowly to its original state and the precession follows its direction.

Image of FIG. 3.
FIG. 3.

(Color online) Spatially resolved spin precession. The magnetic signal integrated along isotherms shows with increasing “radii,” i.e., inner semiminor axis of a wide ring, measured in micrometers from the center of the spot, a decrease of the precession frequency. For comparison the delay times of Figs. 1(c)–1(f) are marked and the shift of the second maximum is visualized by line A.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Slow relaxation of spin reorientation following ultrafast optical excitation